Front

Natural Hazard

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a natural phenomenon that has a negative effect on humans and/or the environment

Front

Volcano

Back

a vent in Earth’s crust through which molten rock flows.

Front

Earthquake

Back

vibrations in the ground that result from movement along breaks in Earth’s lithosphere.

Front

Seismograph

Back

a graphical illustration of seismic waves

Front

Seismic waves

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energy that travels as vibrations on and in Earth

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Focus

Back

a location inside Earth where rocks first move along a fault, starting seismic waves

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EMS

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emergency broadcast system

Front

Fault

Back

a break in Earth’s lithosphere where one block of rock moves toward, away from, or past each other

Front

Epicenter

Back

the location on Earth’s surface directly above an earthquake’s focus

Front

P-Wave

Back

a seismic wave, also called a primary wave, that causes particles in the ground to move in a push-pull motion similar to a coiled spring